1menu "Kernel hacking"
2 3config TRACE_IRQFLAGS_SUPPORT
4 bool
5 default y
6 7source "lib/Kconfig.debug"
8 9config EARLY_PRINTK
10 bool "Early printk" if EXPERT
11 depends on SYS_HAS_EARLY_PRINTK
12 default y
13 help
14 This option enables special console drivers which allow the kernel
15 to print messages very early in the bootup process.
16 17 This is useful for kernel debugging when your machine crashes very
18 early before the console code is initialized. For normal operation,
19 it is not recommended because it looks ugly on some machines and
20 doesn't cooperate with an X server. You should normally say N here,
21 unless you want to debug such a crash.
22 23config CMDLINE_BOOL
24 bool "Built-in kernel command line"
25 default n
26 help
27 For most systems, it is firmware or second stage bootloader that
28 by default specifies the kernel command line options. However,
29 it might be necessary or advantageous to either override the
30 default kernel command line or add a few extra options to it.
31 For such cases, this option allows you to hardcode your own
32 command line options directly into the kernel. For that, you
33 should choose 'Y' here, and fill in the extra boot arguments
34 in CONFIG_CMDLINE.
35 36 The built-in options will be concatenated to the default command
37 line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default
38 command line will be ignored and replaced by the built-in string.
39 40 Most MIPS systems will normally expect 'N' here and rely upon
41 the command line from the firmware or the second-stage bootloader.
42 43config CMDLINE
44 string "Default kernel command string"
45 depends on CMDLINE_BOOL
46 default ""
47 help
48 On some platforms, there is currently no way for the boot loader to
49 pass arguments to the kernel. For these platforms, and for the cases
50 when you want to add some extra options to the command line or ignore
51 the default command line, you can supply some command-line options at
52 build time by entering them here. In other cases you can specify
53 kernel args so that you don't have to set them up in board prom
54 initialization routines.
55 56 For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE
57 options.
58 59config CMDLINE_OVERRIDE
60 bool "Built-in command line overrides firmware arguments"
61 default n
62 depends on CMDLINE_BOOL
63 help
64 By setting this option to 'Y' you will have your kernel ignore
65 command line arguments from firmware or second stage bootloader.
66 Instead, the built-in command line will be used exclusively.
67 68 Normally, you will choose 'N' here.
69 70config DEBUG_STACKOVERFLOW
71 bool "Check for stack overflows"
72 depends on DEBUG_KERNEL
73 help
74 This option will cause messages to be printed if free stack space
75 drops below a certain limit(2GB on MIPS). The debugging option
76 provides another way to check stack overflow happened on kernel mode
77 stack usually caused by nested interruption.
78 79config SMTC_IDLE_HOOK_DEBUG
80 bool "Enable additional debug checks before going into CPU idle loop"
81 depends on DEBUG_KERNEL && MIPS_MT_SMTC
82 help
83 This option enables Enable additional debug checks before going into
84 CPU idle loop. For details on these checks, see
85 arch/mips/kernel/smtc.c. This debugging option result in significant
86 overhead so should be disabled in production kernels.
87 88config SB1XXX_CORELIS
89 bool "Corelis Debugger"
90 depends on SIBYTE_SB1xxx_SOC
91 select DEBUG_INFO
92 help
93 Select compile flags that produce code that can be processed by the
94 Corelis mksym utility and UDB Emulator.
95 96config RUNTIME_DEBUG
97 bool "Enable run-time debugging"
98 depends on DEBUG_KERNEL
99 help
100 If you say Y here, some debugging macros will do run-time checking.
101 If you say N here, those macros will mostly turn to no-ops. See
102 arch/mips/include/asm/debug.h for debugging macros.
103 If unsure, say N.
104 105config DEBUG_ZBOOT
106 bool "Enable compressed kernel support debugging"
107 depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
108 default n
109 help
110 If you want to add compressed kernel support to a new board, and the
111 board supports uart16550 compatible serial port, please select
112 SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to
113 debug it.
114 115 If your board doesn't support uart16550 compatible serial port, you
116 can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
117 debug it. for example, add a new serial port support just as
118 arch/mips/boot/compressed/uart-16550.c does.
119 120 After the compressed kernel support works, please disable this option
121 to reduce the kernel image size and speed up the booting procedure a
122 little.
123 124config SPINLOCK_TEST
125 bool "Enable spinlock timing tests in debugfs"
126 depends on DEBUG_FS
127 default n
128 help
129 Add several files to the debugfs to test spinlock speed.
130 131endmenu
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